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@ale5000-git
ale5000-git committed Oct 7, 2024
1 parent 4353afa commit 3ec96a0
Showing 1 changed file with 19 additions and 19 deletions.
38 changes: 19 additions & 19 deletions tools/bits-info.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -104,9 +104,9 @@ detect_hex_dump_cmd()
dump_hex()
{
if test "${HEXDUMP_CMD:=$(detect_hex_dump_cmd || :)}" = 'xxd'; then
xxd -p -c "${3:?}" -s "${2:?}" -l "${3:?}" -- "${1:?}"
xxd -p -c "${3}" -s "${2}" -l "${3}" -- "${1}"
elif test "${HEXDUMP_CMD?}" = 'hexdump'; then
hexdump -v -e '/1 "%02x"' -s "${2:?}" -n "${3:?}" -- "${1:?}" && printf '\n'
hexdump -v -e '/1 "%02x"' -s "${2}" -n "${3}" -- "${1}" && printf '\n'
else
return 1
fi
Expand Down Expand Up @@ -159,29 +159,29 @@ hex_bytes_to_int()
# $3 Length in bytes (int)
extract_bytes()
{
test "${3:?}" -gt 0 || return 1
printf '%s\n' "${1?}" | cut -b "$((${2:?} * 2 + 1))-$(((${2:?} + ${3:?}) * 2))"
test "${3}" -gt 0 || return 1
printf '%s\n' "${1}" | cut -b "$((${2} * 2 + 1))-$(((${2} + ${3}) * 2))"
}

detect_bitness_of_single_file()
{
local _dbf_first_bytes _dbf_first_2_bytes _dbf_size _dbf_do_bytes_swap _dbf_pos _header _dbf_exe_type _dbf_cpu_type _dbf_i _dbf_tmp_var

if test ! -f "${1?}" || ! _dbf_first_bytes="$(dump_hex "${1:?}" '0' '64')"; then # (0x00 - 0x40)
if test ! -f "${1}" || ! _dbf_first_bytes="$(dump_hex "${1}" '0' '64')"; then # (0x00 - 0x40)
printf '%s\n' 'failed'
return 1
fi
_dbf_first_2_bytes="$(extract_bytes "${_dbf_first_bytes?}" '0' '2')" || _dbf_first_2_bytes=''
_dbf_first_2_bytes="$(extract_bytes "${_dbf_first_bytes}" '0' '2')" || _dbf_first_2_bytes=''

if test "${_dbf_first_2_bytes?}" = '4d5a'; then
if test "${_dbf_first_2_bytes}" = '4d5a'; then
# MZ - Executable binaries for Windows / DOS (.exe) - Start with: MZ (0x4D 0x5A)
# More info: https://wiki.osdev.org/MZ

_dbf_do_bytes_swap='true'
_dbf_pos=''

# APE - Actually Portable Executables - Start with: MZ (0x4D 0x5A) + qFpD (0x71 0x46 0x70 0x44)
if test "$(extract_bytes "${_dbf_first_bytes?}" '2' '4' || :)" = '71467044'; then
if test "$(extract_bytes "${_dbf_first_bytes}" '2' '4' || :)" = '71467044'; then
_dbf_exe_type='APE '
else
_dbf_exe_type=''
Expand All @@ -190,7 +190,7 @@ detect_bitness_of_single_file()
# The smallest possible PE file is 97 bytes: http://www.phreedom.org/research/tinype/
# PE files, to be able to be executed on Windows (it is different under DOS), only need two fields in the MZ header: e_magic (0x00 => 0) and e_lfanew (0x3C => 60)
if
_dbf_pos="$(extract_bytes "${_dbf_first_bytes?}" '60' '4')" && _dbf_pos="$(hex_bytes_to_int "${_dbf_pos?}" '4' "${_dbf_do_bytes_swap:?}")" &&
_dbf_pos="$(extract_bytes "${_dbf_first_bytes}" '60' '4')" && _dbf_pos="$(hex_bytes_to_int "${_dbf_pos?}" '4' "${_dbf_do_bytes_swap:?}")" &&
test "${_dbf_pos:?}" -ge 4 && test "${_dbf_pos:?}" -le 536870912 &&
_header="$(dump_hex "${1:?}" "${_dbf_pos:?}" '26')"
then
Expand Down Expand Up @@ -267,13 +267,13 @@ detect_bitness_of_single_file()
# The absolute offset to the relocation table is stored at: 0x18 (decimal: 24)
# The absolute offset to the relocation table of plain MZ files (so not extended ones) must be: > 0x1B (decimal: 27) and < 0x40 (decimal: 64)
# NOTE: This does NOT apply to PE files as this field is not used on them
if _dbf_tmp_var="$(extract_bytes "${_dbf_first_bytes?}" '24' '2')" && _dbf_tmp_var="$(hex_bytes_to_int "${_dbf_tmp_var?}" '2' "${_dbf_do_bytes_swap:?}")"; then
if _dbf_tmp_var="$(extract_bytes "${_dbf_first_bytes}" '24' '2')" && _dbf_tmp_var="$(hex_bytes_to_int "${_dbf_tmp_var?}" '2' "${_dbf_do_bytes_swap:?}")"; then
if
{
test "${_dbf_tmp_var:?}" -gt 27 && test "${_dbf_tmp_var:?}" -lt 64
} ||
{
test "${_dbf_tmp_var:?}" = 0 && test "$(extract_bytes "${_dbf_first_bytes?}" '6' '2' || :)" = '0000' # Empty relocation table
test "${_dbf_tmp_var:?}" = 0 && test "$(extract_bytes "${_dbf_first_bytes}" '6' '2' || :)" = '0000' # Empty relocation table
}
then
printf '%s\n' '16-bit MZ'
Expand All @@ -285,11 +285,11 @@ detect_bitness_of_single_file()
return 5
fi

if test "$(extract_bytes "${_dbf_first_bytes?}" '0' '4' || :)" = '7f454c46'; then
if test "$(extract_bytes "${_dbf_first_bytes}" '0' '4' || :)" = '7f454c46'; then
# ELF - Executable binaries for Linux / Android - Start with: 0x7F + ELF (0x45 0x4C 0x46) + 0x01 for 32-bit or 0x02 for 64-bit

_header="$(extract_bytes "${_dbf_first_bytes?}" '4' '1')" || _header=''
case "${_header?}" in
_header="$(extract_bytes "${_dbf_first_bytes}" '4' '1')" || _header=''
case "${_header}" in
'02') printf '%s\n' '64-bit ELF' ;;
'01') printf '%s\n' '32-bit ELF' ;;
*)
Expand All @@ -302,7 +302,7 @@ detect_bitness_of_single_file()

local _dbf_is_mach_o _dbf_is_fat_bin _dbf_arch_count _dbf_has64 _dbf_has32

if _header="$(extract_bytes "${_dbf_first_bytes?}" '0' '4')"; then
if _header="$(extract_bytes "${_dbf_first_bytes}" '0' '4')"; then
_dbf_is_mach_o='true'
_dbf_is_fat_bin='false'
_dbf_do_bytes_swap='false'
Expand All @@ -319,7 +319,7 @@ detect_bitness_of_single_file()
_dbf_do_bytes_swap='true' ;;
'cafebabe') # FAT_MAGIC
if
_dbf_arch_count="$(extract_bytes "${_dbf_first_bytes?}" '4' '4')" && _dbf_arch_count="$(hex_bytes_to_int "${_dbf_arch_count?}" '4' 'false')" &&
_dbf_arch_count="$(extract_bytes "${_dbf_first_bytes}" '4' '4')" && _dbf_arch_count="$(hex_bytes_to_int "${_dbf_arch_count?}" '4' 'false')" &&
test "${_dbf_arch_count:?}" -gt 30
then
# Both this and Java bytecode have the same magic number (more info: https://opensource.apple.com/source/file/file-80.40.2/file/magic/Magdir/cafebabe.auto.html)
Expand All @@ -346,7 +346,7 @@ detect_bitness_of_single_file()

if test "${_dbf_is_mach_o:?}" = 'true'; then
if
test "${_dbf_is_fat_bin:?}" = 'true' && _dbf_arch_count="$(extract_bytes "${_dbf_first_bytes?}" '4' '4')" &&
test "${_dbf_is_fat_bin:?}" = 'true' && _dbf_arch_count="$(extract_bytes "${_dbf_first_bytes}" '4' '4')" &&
_dbf_arch_count="$(hex_bytes_to_int "${_dbf_arch_count?}" '4' "${_dbf_do_bytes_swap:?}")" &&
test "${_dbf_arch_count:?}" -gt 0 && test "${_dbf_arch_count:?}" -lt 256
then
Expand All @@ -359,7 +359,7 @@ detect_bitness_of_single_file()
if test "${_dbf_do_bytes_swap:?}" = 'true'; then
_dbf_tmp_var="$(switch_endianness_4 "${_dbf_tmp_var?}")" || _dbf_tmp_var=''
fi
_dbf_pos="$((${_dbf_pos:?} + 20))" || _dbf_tmp_var='' # Should be pos + 32 on FAT_MAGIC_64 (need test)
_dbf_pos="$((_dbf_pos + 20))" || _dbf_tmp_var='' # Should be pos + 32 on FAT_MAGIC_64 (need test)

case "${_dbf_tmp_var?}" in
'01'*) _dbf_has64='true' ;;
Expand Down Expand Up @@ -408,7 +408,7 @@ detect_bitness_of_single_file()
fi

if test "${_dbf_size:?}" -le 65280 && test "${_dbf_size:?}" -ge 2; then
_dbf_tmp_var="$(extract_bytes "${_dbf_first_2_bytes?}" '0' '1')" || _dbf_tmp_var=''
_dbf_tmp_var="$(extract_bytes "${_dbf_first_2_bytes}" '0' '1')" || _dbf_tmp_var=''
if test "${_dbf_tmp_var?}" = 'e9' || test "${_dbf_tmp_var?}" = 'eb' || test "${_dbf_first_2_bytes?}" = '81fc' || test "${_dbf_first_2_bytes?}" = 'b409'; then
# COM - Executable binaries for DOS (.com)

Expand Down

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